From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7F96C433E0 for ; Sun, 17 May 2020 05:12:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADF9E206F4 for ; Sun, 17 May 2020 05:12:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589692370; bh=xtPpd2bre5VjU07gEm8x6R8Gfz9tYMXZIBIRCvVL9gA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=v2XT0sqc+1fwkiU39JvHK18wCSCACmQplAjJ3q17s0ZJfrv+f5yRurTgidYL/c/FR wIyPz1VJAg9TVqMbda0S955iAtzAxHEt179zm4KzjR37TNunOcVhlaUWIdFJ6yjY5y D7wsBJQvzEqMUEqJvUXyJ9qQnDZPJh9gnJbTycF8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726739AbgEQFMt (ORCPT ); Sun, 17 May 2020 01:12:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:44590 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725861AbgEQFMt (ORCPT ); Sun, 17 May 2020 01:12:49 -0400 Received: from mail-wm1-f52.google.com (mail-wm1-f52.google.com [209.85.128.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3B709207F5 for ; Sun, 17 May 2020 05:12:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589692368; bh=xtPpd2bre5VjU07gEm8x6R8Gfz9tYMXZIBIRCvVL9gA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=f6bzA+G3NtuaqDbXqYEHBLoqAvcqrVcf4Lhbh3MnjdiuSNA62YPNC2JscuHfxrZEI 7hk/fa2rYeJrnOcproKWwPbpp1Lk7qnAIjLF45gLC5VqjuQk7pnGtcOpqWdy4tQOrp JVKq2vh1xm4fidSwsDF1M3ECaXZTwwjdNKSnmyMw= Received: by mail-wm1-f52.google.com with SMTP id g14so19791861wme.1 for ; Sat, 16 May 2020 22:12:48 -0700 (PDT) X-Gm-Message-State: AOAM530ZPlOs0zjRX3zYgg4XA76k4g29s0xaPvPnuWMEvlRGkE2b6xwQ C0nGKXKD1WC776DGWremxNI5OzZOM7gZ0NZZYS4s8g== X-Google-Smtp-Source: ABdhPJxYbP+JC8eZBgGujEzxs6f9RroomKcJXs7l2aUQoqcnB07MUEqbsxkBZKSLhvMISqguxPQ7Fq3nOZYSI2nzjSk= X-Received: by 2002:a05:600c:2299:: with SMTP id 25mr12433164wmf.138.1589692366666; Sat, 16 May 2020 22:12:46 -0700 (PDT) MIME-Version: 1.0 References: <20200515234547.710474468@linutronix.de> <20200515235124.673436293@linutronix.de> In-Reply-To: <20200515235124.673436293@linutronix.de> From: Andy Lutomirski Date: Sat, 16 May 2020 22:12:35 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch V6 03/37] nmi, tracing: Provide nmi_enter/exit_notrace() To: Thomas Gleixner Cc: LKML , X86 ML , "Paul E. McKenney" , Andy Lutomirski , Alexandre Chartre , Frederic Weisbecker , Paolo Bonzini , Sean Christopherson , Masami Hiramatsu , Petr Mladek , Steven Rostedt , Joel Fernandes , Boris Ostrovsky , Juergen Gross , Brian Gerst , Mathieu Desnoyers , Josh Poimboeuf , Will Deacon , Tom Lendacky , Wei Liu , Michael Kelley , Jason Chen CJ , Zhao Yakui , "Peter Zijlstra (Intel)" Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 15, 2020 at 5:10 PM Thomas Gleixner wrote: > > > To fully isolate #DB and #BP from instrumentable code it's necessary to > avoid invoking the hardware latency tracer on nmi_enter/exit(). > > Provide nmi_enter/exit() variants which are not invoking the hardware > latency tracer. That allows to put calls explicitely into the call sites > outside of the kprobe handling. Acked-by: Andy Lutomirski